Mortgage Calculator
Calculate your monthly mortgage payment, total interest paid, and the full cost of a home loan over its lifetime.
About the Mortgage Calculator
A mortgage is a long-term loan secured against a property, typically repaid over 15 to 30 years. The monthly payment on a repayment mortgage uses the same amortisation formula as other loans and depends on the amount borrowed, the monthly interest rate and the number of payments. In the early years most of each payment is interest.
The term has a dramatic effect on cost. Because interest is charged on the outstanding balance for much longer, a 30-year mortgage costs far more in total interest than a 15-year one, even though the monthly payment is lower. A larger deposit reduces the amount borrowed and may qualify you for a lower rate.
This calculator estimates the principal and interest part of your payment. Real housing costs often include property tax, insurance, service charges and maintenance, so budget for those separately and confirm figures with your lender.
A 300,000 loan at 6.5% over 30 years has a monthly payment of about 1,896.20 and total interest of roughly 382,600. Over 15 years the payment is about 2,613.32 a month but interest is only around 170,400, a saving of more than 210,000.
Tips for best results
- Compare total interest across several terms and rates, not just the monthly figure.
- Rerun the calculation with a rate slightly higher than your offer to see how sensitive your budget is.
How to use the Mortgage Calculator
Why use Toolseza for Mortgage Calculator?
Use this tool as often as you need with no paywalls, premium tiers, or hidden daily calculation quotas.
All calculations and file manipulations run inside your web browser. Your inputs are never sent to a cloud server.
Results update in real-time as you type or adjust settings, with instant one-click copy and export capabilities.
Works natively on smartphones, tablets, laptops, and desktop computers with zero installation or account creation.
Editorial Standards & Verification: All formulas, algorithms, and conversion factors implemented on Toolseza adhere to openly documented international standards (ISO, NIST, BIPM, W3C). Results are verified against benchmark reference datasets before publication.
Frequently Asked Questions
Is Mortgage Calculator free to use?
Yes — Mortgage Calculator is completely free, unlimited, and requires no sign-up.
Does a higher deposit lower my monthly payments?
Yes — a larger deposit reduces the loan amount, which lowers both the monthly payment and the total interest paid over the mortgage term.
Are the calculations accurate?
Yes — it uses the standard, widely accepted formula, so results are accurate and reliable.
Does it work on mobile and tablet?
Yes — Mortgage Calculator works on any modern browser, including mobile and tablet, no app required.